Subtract 28/80 from 15/7, Solve 2 1/7

Subtract 28/80 from 15/7

1^st number: 2 1/7, 2^nd number: 28/80

15/7 - 28/80 is 251/140.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 80 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 7 × 80 = 560,
15/7 = 15 × 80/7 × 80 = 1200/560
Likewise, for the 2nd fraction, since 80 × 7 = 560,
28/80 = 28 × 7/80 × 7 = 196/560
Subtract the two like fractions:
1200/560 - 196/560 = 1200 - 196/560 = 1004/560
After reducing the fraction, the answer is 251/140
In mixed form: 1111/140

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad